Meaning

• Something done so as to accomplish a purpose.

• A way of motion or functioning.

  "Knead bread with a rocking action."

• Fast-paced activity.

  "a movie full of exciting action"

• A mechanism; a moving part or assembly.

  "a rifle action"

• The mechanism, that is the set of moving mechanical parts, of a keyboard instrument, like a piano, which transfers the motion of the key to the sound-making device.

• The distance separating the strings and the fretboard on a guitar.

• Sexual intercourse.

  "She gave him some action."

• Combat.

  "He saw some action in the Korean War."

• A charge or other process in a law court (also called lawsuit and actio).

• A mapping from a pairing of mathematical objects to one of them, respecting their individual structures. The pairing is typically a Cartesian product or a tensor product. The object that is not part of the output is said to act on the other object. In any given context, action is used as an abbreviation for a more fully named notion, like group action or left group action.

• The product of energy and time, especially the product of the Lagrangian and time.

• The event or connected series of events, either real or imaginary, forming the subject of a play, poem, or other composition; the unfolding of the drama of events.

• (painting and sculpture) The attitude or position of the several parts of the body as expressive of the sentiment or passion depicted.

• Spin put on the bowling ball.

• A share in the capital stock of a joint-stock company, or in the public funds.

Meaning

• To act on a request etc, in order to put it into effect.

• To initiate a legal action against someone.

Meaning

• Demanding or signifying the start of something, usually an act or scene of a theatric performance.

  "The director yelled ‘Action!’ before the camera started rolling."